Tom from SWISCO responded:
March 29, 2021
Thanks for your photos. Based on what I see here, you have either our Series 351 or Series 390, depending on the depth of the bottom shoe. That's the only difference between them. I recommend measuring your shoe and referring to our dimensions to confirm the best match. Your top sash guide is a bit too damaged to be 100% sure about, but our 18-110B is close. Start here and see what you think. Comparison of the S351 and S390 balance shoes.
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